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Linux Commands

Changing file permissions : chmod

linux Commands - Linux Commands
 You can change the permissions of your files (or other people's files if you're the root superuser) by using the command "chmod". The syntax is very simple. For instance if George decides to give write permissions to the administrators, he will type:

chmod g+w myfile

g represents the group of the file (administrators).
w represents the write permission.
+ represents the fact that the permission is added.

If George then lists the permissions using ls -l he obtains:

ls -l...

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Setting SUID and SGID attributes on executable files

linux Commands - Linux Commands
 Setting SUID and SGID attributes on executable files : chmod u+s, chmod g+s

By default, when a user executes a file, the process which results in this execution has the same permissions as those of the user. In fact, the process inherits his default group and user identification.

If you set the SUID attribute on an executable file, the process resulting in its execution doesn't use the user's identification but the user identification of the file owner.

For instance, consider the script...

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